Tire-pressure gage.



R. A.'cAn/1PBELL. TIRE PRESSURE GAGE.

APFLIQATION FILED MAY29| 1914.

1,153,026. Pantedsept. 7,1915.

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.useful Improvements ROBERT A. CAMPBELL, F MINNEAPOLIS, MINNESOTA.

TIRE-PRESSURE GAGE.

Specication of Letters Eatent.

Patented Sept. 1915,

Application led May 29, 1914. Serial No. 841,772.

To all whom it may concern Be it known that l, ROBERT A. CAMPBELL, citizen of the United States, resident of Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and in Tire Pressure Gages, of which the `following is a specification.

`- The object o my invention is to vprovide an indicating device adapted for permanent attachment to a tire by means of which the driver of the car can easily and quickly ascertain the tire pressure without the necessity of applying a gage to each tire.

A further object is to provide a tire pressure gage comprising but few parts and hence economical or" manufacture and not likely to get out of order.

rthe invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims. 4

ln the accompanying drawings forming part oie this speciication, Figure l is a view, partially in section, of a tire gage embodying inv invention, Fig. 2 is a similar view of a niodiiied construction, Fig. 3 is a sectional view on the line m-m of Fig. 2.

ln the drawing, 2 represents a portion of a wheel rirn and 3 isa valve nipple having a valve i therein. The nipple 3 is eXteriorly threaded to receive an interiorly threaded sleeve 5 that is seated upon a gasket G on the end of the nipple 3. therein through which the stern of the valve lprojects. A casing 8 is mounted on the sleeve 5 and is provided with a chamber Si therein, communicating with the port 7 and also with an intake valve l0 through *which the air pressure is admitted to the chamber. IThe wall oit the chamber 9 opposite the port 7 is provided with a passage 1l, A. valve l2 is arranged to close Jfhe passage il and has a stern l projecting through said passage and a spring le normally holds the valve in its closed position. il stud l5 is mounted in the valve l2 concentric with the valve l in position to and open the valve fl, when the valve l2 is moved from its To unseat the valve i2, prefer to provide v Fcoveted surface l@ on the stein ll in the ci a siinilar surface 17 provided on the vn oiE push hutten. i9, said stern sliding transverse socket 2U formed in the cas- 8. il. spring 2l norlially holds the push The sleeve 5 has a port button and its stem in their retracted position, and a stud 22, projecting into a slot 23 in the stem, operates as aguide therefor and also limits the movement of thel stem in both directions. A passage 24: leads from the socket to a gage 25 having a suitable dial 26 with an indicator handarranged to move over the face of the dial and indicate the air pressure in pounds in the tire. rlhis gage is of ordinary construction, and l have not thought it necessary to illustrate it in detail herein.

The device may loe permanently mounted on the tire and when the driver of the car wishes` to ascertain the pressure in the tire he will force the push button inwardly against the pressure of its spring, unseat the valve l2 suiliciently to open the air valve l, whereupon the air will escape from thetire and 'Flowing up through the chamber 9 to the gage, will indicate the air pressure in the tire. To inflate the tire, it is only necessary to remove the cap 27, attach an air supply to the valve l() and allow any desired pressure to enter the tire. v

ln Fig, 2 l have shown a modified construction, which consists in providing a sleeve 2S, interiorly threaded, to engage the threads lo' the valve nipple and having a rock shaft 29 mounted therein upon the inner end ot which is an arrn 30 in position to engage and open the valve 4 when the shaft is rocked to a predetermined point. The end ci the shaft projects through the wall of the sleeveand is provided with an operating lever 3l. lUpon the sleeve 28 second sleeve `32 is mounted and within the sleeve 32 isa sliding tube 33 graduated to indicate points ot pressure and having a cap 34 at its outer end that is normally seated. on the outer end oli the sleeve 32. lWithin the tube 33 is a spring 35 connected at one end to the cap 3a and having its opposite nro'ectine throu h a ort 36 in the end wall L E the sleeve 28 and connected to the arm 30 to normally hold said arm in its raised position. The valve 3i" is carried hy the said end ot the spring to hear on the wall et the sleeve 28 and normally close against passage ci air; this port and the tire valve ohainher 35 is termedwith which the air supply valve communicates in the same manner as de sorihed with reference to the c7 to initiate the tire 'the air is ad ed to this loer 9 and the port 35 valve to the tire. Whenever the operator desires to ascertain the degree of pressure in the tire, he may rock the shaft 29 by means of the lever 31, open the tire valve, admit air therefrom to the chamber 38 and the port 3G, and suiiicient pressure having entered the tube 33 to overcome the tension of the spring therein, the tube will be projected outwardly until the graduations thereon are visible to indicate the number of pounds of pressure in the tire.

I claim as my invention:

l. The combination, with a tire valve, of a casing having an indicating device, a member in said casing to open communication between the tire and said indicating device, means exterior to said casing for operating said member, and a spring connected with said indicating device and said member in their retracted positions.

2. The combination, with a tire valve, of a casing mounted thereon, an indicating device mounted on said casing, a member in said casing to open communication between the tire and said indicating device, a lever exterior to said casing for operating said member, and a spring connected with said indicating device and with said member and normally holding said indicating device and said member in their retracted positions.

In witness whereof, I havehereunto'set my hand this 22d day of May, 1914.

ROBERT A. CAMPBELL. Witnesses:

GENEvmvE E. SORENSEN, EDWARD A. PAUL. 

